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The absolute worst internet THING created, second to (i shudder to type): SWAG.

Meaning You Only Live Once, it practically makes you believe you can do ANYTHING and you have the right to do everything, no matter how stupid. The people that say this practically enter derp moments.
Tim: #Yolo I just downed 5 kegs of beer #Yolo
Frank: Yolo. You. Only. Live. Once. Don't f***ing waste it. By the way, you are a real derp.

Note: These are random names.
by Somebody1010 June 12, 2013
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An over used Internet meme that only n00bs and fagbags use.
Fag #1:Hey did you see the new gay p0rn?

Fag #2: yeah, they should worry about aids.... Cuz ya know wit they say..#YOLO...but for realzies..
by Luke_Chaos April 11, 2013
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YOLO- You Only Live Once
As once heard in the 'deathcore' band Suicide Silence's song "You Only Live Once" it has been turned into a "hash tag" by Tumblr, Facebook, Twitter, and other social networking sites.
Kid 1: What's #YOLO?
Kid 2: YOU ONLY LIVE ONCE!

SUICIDE SILENCE FTW!!!!!!!!!!!

You Only Live Once, so just go f..king nuts!
by SSluver March 11, 2012
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